Are the sentences correct or incorrect

1. Optical illusions are a recent idea.

2. Akiyoshi Kitaoka designed his optical illusion for a car advertisment.

3.There are several of Alexander McQueen’s ‘optical illusions’ dresses.

4. You can find optical illusions in the natural word.

5. In Professor Wiseman’s experiment people had to draw a brick.

6. In the experiment, the more creative people found it easier to see the duck and the rabbit.